Narada Power Source Co., Ltd. REXC operation manual V1.2
17
In the case of mains supply, the maintenance and battery recharge methods be the same
as clause 4.1.
In case of without mains supply, should cut off the load, then the solar and wind
generating can charge the battery, but maximum limited voltage 2.30V/cell, maximum
current 0.20 C
10
A. The battery fully charged on condition that the charging current is
less than 0.005C
10
or the charging voltage stay constant for four hours.
5. Storage
The storage area of REXC series batteries must be clean, ventilated, dry and without
direct sunshine. All lead acid batteries lose capacity when standing on open circuit
because of self-discharge. The result is that the voltage of open circuit is decreased,
and the capacity also decreased. The self-discharge rate is related with ambient
temperature. The self-discharge degree is smaller when the ambient temperature is
lower, otherwise is larger. Batteries should be supplementary charged if they have been
stored for six months or the open circuit voltage is lower than 2.10V/cell. The
equalization charge method should be adopted. All batteries, which are ready to store,
should be fully charged before storage. It’s suggested to record storage time in periodic
maintenance record and record the time when another necessary supplementary charge
should be made. The quality certificates of REXC series batteries record the latest
charge time of the batteries, next charge time can be calculated according to this charge
time.
6. Maintenance
In order to assure service life, the batteries should be correctly inspected and
maintained. The maintenance methods of REXC batteries are recommended as
follows:
6.1 Monthly Maintenance
— Keep the battery-room clean.
— Measure and record the ambient temperature of the battery-room.
— Check each battery’s cleanness; check damage and overheating trace of the
terminal, container and lid.
— Measure and record the total voltage and floating current of the battery system.
6.2 Quarterly Maintenance
— Repeat monthly inspection.
— Measure and record floating voltage of every on-line battery. If more than two
cells’ voltage is less than 2.18Vpc after temperature compensation, the
batteries need to be equalization charged.
6.3 Yearly Maintenance
— Repeat quarterly maintenance and inspection.
— Check whether connectors are loose or not every year and tight them
— Make a discharge test to check with exact load every year, discharging 30-40%
of rated capacity. Make an 80%DOD capacity test every year after three years’
operation.
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